Improvement in steam or water engines



2 Sheets--Sheet 1. L. D. B. s HAw.

lmprovemen in Steam or Water Engines.

No.. 121,42 Patented Nov- 28,1871.

2 Sheets-#Sheet 2. L. D. B. SHAW.

Improvement in Steam or Water Engines. l No. 121,427, Patented Nov.2e,1e71.

jay. J.

. f /077 /wfo #ff-may vPATENT GEEIOE.

p LORENZO D. E. SHAw, or BOSTON, MASSACHUSETTS.

IMPROVEMENT IN STEAM OR WATER ENGINES.

Specification forming part of Letters Patent No. 121,427, dated November 28, 1871.

To all whom fit 'may concern:

Beit known that I, LORENZO D. B. SHAW, of Boston, in the county of Suffolk and State of Massachusetts, have invented a new and useful Improvement in Steam or Water Engines; and I do hereby declare the following to be a full and correct description of the same, reference being had to the accompanying drawing, in which- Figure 1 is a front elevation of an engine containing my improvement. Fig. 2 is a side elevation ofthe same; and Fig. 3 is a central vertical section, showing the valves and the interior mechamsm.

Similarletters of referenceindicate corresponding parts in the several figures.

The object of this invention is the production of `an engine wherein steam or water is used as the motive-power, and which has a complete circulation through two cylinders secured together, the induction and eduction of the steam being regulated by cylindrical valves in each cylinder or chamber. It consists of two cylinders made separately or otherwise and Secured together by heads of suitable construction, and provided with induction and eduction pipes, either of which may be used to receive or exhaust. In the chamber formed by these cylinders the steam or water has a complete circulation controlled by valves in each cylinder, said valves being made of cylindrical form, as will be hereinafter more specifically set forth.

Referring to the drawing, E F represent two cylinders, made separately or together, secured and closed by heads A1 A2, which are attached to one another by rods e e, said rods being threaded at 'one end and provided with nuts ff. These heads are made with passages J and K, which, when the heads are secured on the cylinders, form a part ofthe valve-chamber. The cylinders E F are provided with induction and eduction pipes A B, respectively, which may, however, be used convertibly. These pipes may be located at the sides or in front of the cylinders, being here shown at the sides for the better illustration of the operation of the engine. The valves, forming the principal part of my invention, are constructed as follows: Fig. 3 shows the parts enlarged and in detail. Cylinders G and H are secured inside of the cylinders E F and form seats for cylindrical slide-valves G D, respect ively. Ports a and b are made in cylinder G, and ports c and d are made in cylinder H, and the valves C and D are made of Such length as that the ports b and c of the cylinders will be open at times, while the ports a and d will be closed, the valves C and D being at the top and bottom of the cylinders G and H, respectively. Valve C I call the supply-valve and valve D the exhaust, when the engine is constructed as in this case. A piston, l?, having a rod, N, is used in cylinder G, and a solid partition, Q, is placed in cylinder H for purposes to be explained. A bracket, X, is secured over the cylinder by the rods e e and nuts ff, and in its upper end a flywheel, W, has its bearings. 0n the shaft of said fly-wheel eccentrics V Y are Secured, to which pitman-rods T U are attached, the former provided with a slide and connected with and operating the piston-rod N, and the latter connected with and operating a lever, Z, pivoted at i to the bracket X. Rods B and S are attached to the opposite ends of lever Z, and are secured to the valve-stems L M, whereby, when the engine is in motion, the valves receive an alternating up-and-down motion.

The operation of the engine is as follows: Steam or water is admitted into the cylinders at A, and, taking a downward direction, passes through the ports b, supposing the parts to be in the position shown in Fig. 8, and through the pipe K into the cylinder H, where it is stopped by the partition Q. Part escapes through ports c, and, ascending through cylinder F, exhausts at B 5 and part accumulates in pipe K and under piston I), whereby the piston is forced up, which sets the fly-wheel in motion and thereby operates the valves. The valve C is forced down and valve D drawn upwhen the ports a and d are opened and b c closed. rlhe steam or water is admitted into pipe J through ports a, obstructed in its passage through cylinder H by the upper side of partition Q, is forced back into pipe J and cylinder F, part exhausts at d B, and part forces the piston down, and so on.

It will be. found that by making the valves and their Seats cylindrical the pressure of the steam or water is more equally distributed, and that thereby the operation of the parts is greatly facilitated, less friction is produced, and consequently there is less Wear and leaking. By having the ports a d or b c open at one time the quantity of steam used is nicely regulated, and hence the operation of the valves and piston is easy and regular.

What I elaim isl. A steam or Water engine having cylindrical valves C D and valve-seats G H, When operating in the manner and for the purpose set forth.

2. The combination, in a steam or Water enine, of cylindrical valves and valve-seats With the piston P, and partition Q, and pipes J and K, When operated by the induction and education of steam or Water alternately through ports a d 

